Motopy

- Add code annotation("code annotation" is python statment in mfile start with "%%>") the code annotation will insert to pyfile and mask next matlab/octave stament.
- Add `port.py` and `utils.py`
- Fix known bugs.

- Translate support for `while` block.
- Translate support for "struct" Creation: `s.m = val`.
- Translate support for functions: `abs`, `audioread`, `cell`, `dir`, `find`,
`length`, `mod`, `num2str`, `rand`, `strcat`, `tic`, `toc`.
- `for k = int_val0:int_val1` will translate to: `for k in range(int_val0, int_val1+1)`
- `[str1, str2, ..]` will translate to `''.join([str1, str2, ..])`

- This is original version.
- Translate support for `function` definition.
- Translate support for `for`, `if..elseif..else` block.
- Translate support for `start_val:end_val`, `start_val:step_val:end_val`
- Translate support for array creation: `[..]`, `ones()`, `zeros()`
- Translate support for array copy: `B = A` --> `B = A.copy()`
- Translate support for format text.
- Translate support for functions: `acos`, `asin`, `atan`, `ceil`, `cos`,
`diag`, `disp`, `eye`, `exp`, `fft`, `fix`, `floor`, `fprintf`, `ifft`,
`inv`, `linspace`, `load`, `log`, `log10`, `log2`, `max`, `ndims`, `numel`,
`ones`, `pinv`, `rank`, `round`, `sin`, `size`, `sort`, `sprintf`,
`sqrt`, `unique`, `zeros`.